Last month, we saw Motorola's Droid Razr Maxx HD offered up for $99.99 on Amazon for new accounts only. If you're already a Verizon subscriber who's looking to instead upgrade to the Maxx HD, you're in luck – it looks like Amazon has extended the offer to upgrade customers as well. For reference, Amazon's price puts the phone a full $200 below Verizon's own price.